Sonic Waveform Data
Science operator: Texas A&M University
Hole: U1463B
Expedition: 356
Location: Northern Carnarvon Basin (Tropical SE Indian Ocean)
Latitude: 18° 57.9190' S
Longitude: 117° 37.4340' E
Logging date: September 15-16, 2015
Sea floor depth (driller's): 156 m DRF
Sea floor depth (logger's): 158 m WRF (FMS/DSI/GPIT/EDTC/HNGS pass 2)
Total penetration: 686 m DRF (530 m DSF)
Total core recovered: 399.10 m (75.3 % of cored section)
Oldest sediment recovered: Late Miocene
Lithology: Wackestone, packstone, mudstone, rudstone and floatstone. Mudstone, dolostone, sand rich in glauconite and gravel towards the bottom of the hole.
Acoustic tool used: DSI (Dipole Sonic Imager)
Recording mode: Monopole P&S mode, lower and upper dipole (all passes)
Remarks about the recording: none.
MONOPOLE P&S MODE: measures compressional and hard-rock shear slowness. The monopole transmitter is excited by a high-frequency pulse, which reproduces conditions similar to previous sonic tools.
UPPER DIPOLE MODE: measures shear wave slowness using firings of the upper dipole transmitter.
LOWER DIPOLE MODE: measures shear wave slowness using firings of the lower dipole transmitter.
Acoustic data are recorded in DLIS format. Each of the eight waveforms generally consists of 512 samples, each recorded every 10 (monopole P&S) and 40 microsec (dipolemodes), at depth intervals of 15.24 cm (6 inches).The original data in DLIS format is first loaded on a Sun system using GeoFrame software. The packed waveform data files are run through a GeoFrame module that applies a gain correction and then converted into ASCII and finally binary format.
Number of columns: 4097
Number of rows: 2396 (downlog)
Number of rows: 2074 (pass 1)
Number of rows: 2386 (pass 2)
The following files have been loaded:
DSI from FMS/DSI/GPIT/EDTC-B/HNGS (Downlog, drill pipe at ~79 m WSF)
356-U1463B_mono_d.bin: 79-444 m WSF
356-U1463B_ldip_d.bin: 79-444 m WSF
356-U1463B_udip_d.bin: 79-444 m WSF
DSI from FMS/DSI/GPIT/EDTC-B/HNGS (Pass 1, recorded open hole)
356-U1463B_mono_p1.bin: 1276-443 m WSF
356-U1463B_ldip_p1.bin: 1276-443 m WSF
356-U1463B_udip_p1.bin: 1276-443 m WSF
DSI from FMS/DSI/GPIT/EDTC-B.HNGS (Pass 2, drill pipe at ~79.5 m WSF)
356-U1463B_mono_p2.bin: 79.5-443 m WSF
356-U1463B_ldip_p2.bin: 79.5-443 m WSF
356-U1463B_udip_p2.bin: 79.5-443 m WSF
The sonic waveform files are depth-shifted to the seafloor (-158 m from FMS/DSI/GPITEDTC/HNGS Pass 2 - Reference run for depth matching ). The downlog and pass 1 are not depth-matched to the reference run. Please refer to the 'depth_matches' folder in the hole index page for the depth-matching values and to the "DEPTH SHIFT" section in the standard processing notes for further information.
Additional information about the drilling and logging operations can be found in the Operations and Downhole Measurements sections of the expedition report, Proceedings of the International Ocean Discovery Program, Expedition 356.